Yacas
is a general purpose computer algebra system. Contact Ayal Zwi
Pinkus at apinkus@xs4all.nl.
HartMath is an online Java
computer algebra applet. It is licensed under the terms and
conditions of the GNU general public license (GPL).
EMail: webmaster@hartmath.com. Contact: Klaus Hartlage
The OpenXM project
is aiming to build a unified system of which components are
free mathematical softwares for experts. The current version 1.1.2
(stable) released in March, 2000.
Prologie, THE library for arbitrary
precision arithmetic, operating on natural, integer and
rational numbers.
GiNaC, a C++ library to allow
embedding of symbolic manipulations within other applications.